There are less than 50 known whalefalls in the world.
世界上已知的鲸落不到50个。
2
Species similar to those at whalefalls may have depended on dead Marine reptiles for hundreds of millions of years.
与鲸鱼尸体构成的生态系统类似的物种可能依靠着亿万年来死去的海洋爬行动物的尸体生存。
3
Numbering well under 50, the eastern North Pacific right whale --which can reach up to 18 metres (60 feet) in length -- falls below theIUCN's threshold of likely viability as a species.